19 terms

Precalculus Identities

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sinθ =
cos(π/2 - θ)
cosθ =
sin(π/2 -θ)
tanθ
cot(π/2 - θ)
cscθ
sec(π/2 - θ)
secθ
csc(π/2 - θ)
cotθ
tan(π/2 - θ)
sin(-θ)
-sinθ
csc(-θ)
-cscθ
cos(-θ)
cosθ
sec(-θ)
secθ
tan(-θ)
-tanθ
cot(-θ)
-cotθ
1 = ... + ...
sin²θ, cos²θ
sec²θ = ... + ...
tan²θ, 1
csc²θ = ... + ...
cot²θ, 1
sin²θ =
1 - cos²θ
cos²θ =
1 - sin²θ
tan²θ =
sec²θ - 1
cot²θ =
csc²θ - 1
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